Multi-antenna techniques can be used to achieve improved system performance, including improved system capacity (more users per cell) and improved coverage (possibility for larger cells), as well as improved service provisioning, for example, higher per-user data rates. This study provides an overview of space-time diversity technique using Alamouti codes applied to the 3G evolution. The delays...

Space-time coding is used for reliable high rate transmission over wireless digital channels with multiple antennas at both the transmitter and receiver ends. From a mathematical point of view, a space-time block code (STBC) consists of a family of matrices with complex entries (the codebook) that satisfies a number of properties which determine how well the code performs. The first aim is to f...

This paper explores the extensions of the Alamouti code to frequency selective channels. The Lindskog-Paulraj (LP) extension to frequency selective channels as well as the Diggavi, Al-Dhahir and Calderbank extension to multiple users will also be covered. The schemes will be shown both in D-domain and its corresponding version using finite block length matrices. Finally, simulations are done us...

In this work, we consider the application of the well-known space-time block code (STBC), the Alamouti-scheme, as inner code within a “turbo” coding scheme for the multiple-input-multiple-output (MIMO) Rayleigh fading channel. We analyze therefore the applicability of the Alamouti-scheme for iterative space-time detection and decoding applied at the receiver. To this end, we use extrinsic infor...

In this paper we study the effects of timing errors on distributed space-time codes for collaborative communications. We assume a half duplex, decode and forward scheme, where two relaying nodes are not perfectly synchronized in forwarding. We analyze 1) the impact of this asynchronism on the performance of an Alamouti and a Golden code scheme with different types of detectors, and 2) the sensi...

The Alamouti space-time code for transmission diversity is extended recursively to 2n×2n antenna elements as well as to unsymmetrical arrays of the size m × n. The proposed schemes exhibit two significant advantages: they allow for higher diversity (of degree 2 for the symmetrical case) and at the same time can be implemented as zero-forcing or MMSE type at low complexity avoiding any matrix in...

In this paper, we exhibit 2×2 MIMO framework utilizing alamouti space time Block code for level blurring channel. In non level blurring channel i.e. recurrence particular multipath channel, convolution of the channel drive reaction with STBC yield crushes the orthogonality of the STBC that can be comprehended by utilizing Orthogonal Frequency division Multiplexing (OFDM). At long last, we contr...

A turbo decoding scheme for a noncoherent, unitary space-time modulated [3] communication system employing an FEC convolutional code is proposed. The channel is assumed to be Rayleigh fading with neither the transmitter nor the receiver knowing the channel coefficients. The convolutional encoder is applied to the information symbols before performing unitary spacetime coding. Treating the combi...

In this paper, the impact of Forward Error Correction (FEC) code namely Trellis code with interleaver on the performance of wavelet based MC-CDMA wireless communication system with the implementation of Alamouti antenna diversity scheme has been investigated in terms of Bit Error Rate (BER) as a function of Signal-to-Noise Ratio (SNR) per bit. Simulation of the system under proposed study has b...

It is known that the Alamouti code is the only complex orthogonal design (COD) which achieves capacity and that too for the case of two transmit and one receive antenna only. Damen et al. proposed a design for 2 transmit antennas, which achieves capacity for any number of receive antennas, calling the resulting STBC when used with a signal set an informationlossless STBC. In this paper, using c...